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Finding the Fourth Proportional to 287,152.20, 430,728.30 and 129,688.20

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Solution

The fourth proportional to 287,152.20, 430,728.30 and 129,688.20 is: 194,532.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,152.20 : 430,728.30 = 129,688.20 : x
  2. Step 2: Convert to fraction form
    287,152.20/430,728.30 = 129,688.20/x
  3. Step 3: Cross multiply
    287,152.20x = 430,728.30 × 129,688.20
  4. Step 4: Simplify right side
    287,152.20x = 55,860,377,916.06
  5. Step 5: Solve for x
    x = 55,860,377,916.06/287,152.20
  6. Step 6: Final answer
    x = 194,532.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.